Depending on the type of copper you used,you may very well NEVER keep a reef in that tank again.Most copper treatments will soak into the rock,substrate,and even the silicone that is holding the tank together.It will then slowly leach this copper back into the water.This is impossible to clear out of a tank...You will need to check to see if your treatment is formulated to stay suspended in the water.If so,then you may have hope.But not till alot of time,and water changes are done.If you used the "true" copper,then you will need to start all over with new rock,substrate,and a new tank...